api-and-interface-design

Name: api-and-interface-design
Availability: InStock
Author: TinNguyen

Design stable REST and GraphQL API contracts with consistent naming and error semantics.

1|Updated Jan 26, 2026

Search Tags:#design #api #interfaces #rest #graphql #contract-first

Ready to run

npx skills add https://github.com/AskTinNguyen/vesper-team-skills --skill api-and-interface-design-asktinnguyen

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: api-and-interface-design
Source: https://github.com/AskTinNguyen/vesper-team-skills/tree/main/api-and-interface-design
Command: npx skills add https://github.com/AskTinNguyen/vesper-team-skills --skill api-and-interface-design-asktinnguyen

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Guides stable API and interface design across modules, reducing integration friction and miscommunication between teams.

Core Features & Use Cases

Contract-first interface design to define public surfaces before implementation.
REST and GraphQL endpoint design, module boundaries, and cross-team data contracts.
Guidelines for naming, error semantics, versioning, and boundary validation to maintain consistency across teams.

Quick Start

Draft the API contract first by specifying interfaces, methods, inputs, outputs, and error models before implementation.

Frequently Asked Questions about api-and-interface-design

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

What is contract-first API design and why should I use it?▼

Contract-first API design defines interfaces, methods, inputs, outputs, and error models before implementation. This approach reduces integration friction and miscommunication between frontend and backend teams by establishing stable public surfaces early.

How do I design stable REST and GraphQL APIs for team handoffs?▼

Design stable REST and GraphQL APIs by applying consistent naming, clear error semantics, and boundary validation. Define module boundaries and cross-team data contracts upfront to maintain interface stability throughout the integration process.

What's the best way to define module boundaries and interface contracts?▼

The best way to define module boundaries and interface contracts is to draft the API contract first. Specify public surfaces, methods, inputs, outputs, and error models before implementation to ensure consistent, stable interfaces across teams.

Does contract-first design work for both REST and GraphQL endpoints?▼

Yes, contract-first design works for both REST and GraphQL endpoints. It provides guidelines for naming, error semantics, versioning, and boundary validation to maintain consistency across modules and team handoffs regardless of the API protocol.

When should I not use contract-first interface design?▼

You should avoid contract-first interface design when rapid prototyping is required before any module boundaries are established. Defining stable public surfaces and error models upfront adds overhead that may not suit highly volatile, exploratory development phases.

Why does API integration break down between frontend and backend teams?▼

API integration breaks down due to miscommunication and inconsistent interface contracts. Without stable APIs, clear naming, and defined error semantics, teams face integration friction caused by mismatched expectations and shifting module boundaries.